Improve errors for csv-table-file
and csv-table-url
#1804
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I'm not actually sure how to test this, since my local testing strategy for stuff like this would usually use the local CPO, but CSVs are not usable through CPO.
But, it's also a pretty minimal (and perhaps, not that great?) change.
Either way, it would be good to have some improvement for #1803 before students start trying to use the
csv
stuff -- people bumped into this issue really quickly.